1、簡單構建類和對象和id使用的測試代碼如下

Person.h

#ifndef Person_h #define Person_h#import <Foundation/Foundation.h> @interface Person : NSObject {NSString* _name;int _age; } -(void)setName:(NSString *)name addAge:(int)age; -(void)say:(NSString *)content; -(NSString *)info; +(void)foo; @end #endif /* Person_h */

Person.m

#import "Person.h"@implementation Person {int _testAdd; } -(void)setName:(NSString *)name addAge:(int)age {_name = name;_age = age; } -(void)say:(NSString *)content {NSLog(@"content is %@", content); } -(NSString *)info {[self test];return [NSString stringWithFormat:@"the persion is %@, and age is %d", _name, _age]; } -(void)test {NSLog(@"this is test method"); }+(void)foo {NSLog(@"this is foo method"); } @end

main.m

#import "Person.h"int main(int argc, char * argv[]) {@autoreleasepool {Person *person = [[Person alloc] init];[person setName:@"chenyu" addAge:26];NSString *info = [person info];NSLog(@"%@", info);[person say:@"chenyu"];[Person foo];//id類型可以代表所有對象的類型，id類型執行方法會動態綁定//id p不是id *p;id p = [[Person alloc] init];[p setName:@"chenyu" addAge:26];NSString *in = [p info];NSLog(@"%@", in);[p say:@"chenyu"];} }

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2、運行結果

this is test method the persion is chenyu, and age is 26 content is chenyu this is foo method this is test method the persion is chenyu, and age is 26 content is chenyu

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總結

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